The glowing blue Nymphaeum of Emperor Tiberius.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

A bust of Franz Kafka spins in pieces, reflecting the writer's inner torment.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

The first museum in the world devoted to sexual gadgetry.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

Frida Kahlo's childhood home, now a museum of her life and works.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

A fascinating insight into daily life in the Eastern Bloc.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

Monasteries on rock pillars, once accessible only by frayed ropes.

This replica of the Greek structure is in the heart of Nashville.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

Ruins of a German castle on top of a towering stone pillar.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Northern Ireland's Brobdingnagian stepping stones.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

An ancient capital city that dates back 3,000 years and harbors many surprises.